CN1699208A - Method and apparatus for treating urban sewage by means of flue gas desulfurization of power plant and fly ash - Google Patents
Method and apparatus for treating urban sewage by means of flue gas desulfurization of power plant and fly ash Download PDFInfo
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- CN1699208A CN1699208A CNA2005102003490A CN200510200349A CN1699208A CN 1699208 A CN1699208 A CN 1699208A CN A2005102003490 A CNA2005102003490 A CN A2005102003490A CN 200510200349 A CN200510200349 A CN 200510200349A CN 1699208 A CN1699208 A CN 1699208A
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Abstract
Disclosed is a method and apparatus for treating urban sewage by means of flue gas desulfurization of power plant and fly ash, which integrate the utilization of waste water, waste gas and waste slag in environmental engineering, by reutilizing industrial waste, the urban sewage water can be reused and meet the national standard for recycled water after ecological treatment, the problem of coal ash depositing is also solved.
Description
Technical field
The invention belongs to the novel ecological field of engineering technology that waste water,waste gas and industrial residue is handled and fully utilized in the environmental engineering.
Background technology
Guangming Daily and other newspapers have all been reprinted the problem that the deputy bureau director Wang Jirong of State Environmental Protection Administration is found to China municipal sewage plant running condition special examination of medium circular in July, 2004: 532 sewage works that checked, 275 abnormal runnings are arranged, account for 51.7%.Wherein, 43 basic abnormal operations account for 8.1%; 121 of operating load less than 30% account for 22.7%; 111 of exceeding standard of water outlet account for 20.9%, and the fate that on average exceeds standard is 152 days.These 532 sewage work's designing treatment abilities are 145.6 hundred million tons, and 95.9 hundred million tons of actual treatment abilities only are 65.9% of designed capacity; Exceed standard in 111 sewage works of blowdown, what total phosphorus and total nitrogen exceeded standard accounts for more than 60%, becomes main pollution factor.Although it is many-sided causing the reason of the problems referred to above, the investment of sewage treatment process and working cost height are the keys of problem.Bear relatively difficulty of sewage disposal expense by municipal administration fully, and bear the not smooth problem of existence charge channel, thereby operational difficulty is bigger by operation company.Therefore, fundamentally solve sewage handling problem and just must develop the processing unit that investment is little, working cost is low, and working hard aspect the execution of management and environmental legislation.
Simultaneously; State Environmental Protection Administration has announced China's ten big atmospheric pollution city lists first in environmental management of national environmental protection key cities and comprehensive improvement annual report; wherein great majority are the city that coal and energy industry are concentrated, and sulfurous gas becomes important pollution factor in the zone.The generation of trade waste corresponding with it is also more, particularly the output of trade waste such as flyash is occupied critical role, how to reduce atmospheric pollution level, makes full use of trade waste, and the processing of water, gas, slag is incorporated into one, is basic point of departure of the present invention.
Summary of the invention
Purpose of the present invention just provides a kind of minimizing topsoil, makes full use of trade waste, and the processing of water, gas, slag is incorporated into municipal effluent and the means of flue gas desulfurization of power plant and the Ash Utilization method and apparatus of one.
Technical solution of the present invention is that according to ecological principle, the transmission mobile, information of the circulation of material, energy is the major function of the ecosystem.Municipal sewage treatment proposed by the invention and means of flue gas desulfurization of power plant and Ash Utilization technology just are being based on ecological principle and the ecological treatment system developed with equipment.Its basic craft course is summarized as follows:
Municipal effluent promptly contains industrial sewage and handles back qualified discharge part, collects and is transported to the area with coal-fired flue-gas source, as pending sewage, carries out homogeneous and adjusting simultaneously;
This sewage enters pretreatment stage then, utilize the inorganic molysite coagulating agent of by-product in the flue gas desulfurization course to carry out coagulating treatment, we apply for a patent, patent No. ZL00101556.7, after removing suspended particle contact scar thing and colloid pollution thing, prepare to enter ecological treatment system;
This ecological treatment system adopts plant-microorganism alternate treatment system, and in order to guarantee normally to move in the winter time, adopt printing opacity greenhouse 22 structure formations, insulation utilizes the gas behind the coal desulfurization, both can reach the purpose of Winter protection, can be plant-growth again competent carbonic acid gas is provided, simultaneously can also provide oxygen for microorganism growth, during treatment system employing water distribution manner at intermittence, microbial film can absorb oxygen from flue gas, and the used filler 20 of this treatment system is made after utilizing coal-fired waste residue flyash just and cement mixing by a certain percentage, at last, this device is gone back by-product wetland plant series products 21: economic grass, and flowers, or the like;
Through the water after this system handles following purposes can be arranged: agricultural water, the forestry water, urban afforestation water, building water, the process advanced treatment contains can be used for industrial circulating cooling water and particular industry water, and China's shortage of water resources is significant for alleviating;
The used filler 20 of this treatment system is granular, diameter is between the 3-10 millimeter, material is for based on flyash, the vesicular inert substance that is prepared into as solidifying agent with cement in addition, be with coal-fired waste residue flyash and cement by 3: 1-6: make after 1 the mixed; Have good biological attachment power and bigger specific surface area, also help the transmission of oxygen simultaneously;
The gas temperature that is used for Winter protection in this system is at 30-40 ℃, derive from the tail gas behind the coal-fired flue gas desulfurization, contain the oxygen of 5-10% and the carbonic acid gas of 4-8%, can guarantee that the unitary temperature of Ecological Disposal is at 20-30 ℃ winter, can use summer in the same old way, this gas is except heat insulation function, containing to provide competent carbonic acid gas for plant-growth, promote photosynthetic carrying out daytime, provide certain oxygen for plant and microorganism evening, promote its respiratory, promote organic decomposition course;
The coal burning system that this system relied on, discharge a large amount of flue gas that contains sulfurous gas, oxynitride and solid waste-flyash, wherein sulfurous gas has become the greatest contamination factor of China's topsoil and acid rain, we have developed resource recovery FGD process technology, patent No. ZL00101556.7, utilize industrial waste iron filing as sweetening agent, by-product is the inorganic molysite coagulating agent of main component with ferric sulfate, both can solve the sulfur dioxide emissions problem, recyclable again sulphur resource and iron resources are used for sewage disposal and need a large amount of coagulation process that use;
The flyash of coal burning system discharging is used for the production of filler, it is another important feature of the present invention, it is to utilize trade waste to realize the canonical process of resource utilization, the chemical stability of flyash provides possibility for using as filler in the water treatment, certain processing technique makes it to become the graininess filler of different performance and specification again, can replace the ceramics filling of present widespread use.
In this system, the water distribution manner of sewage can be adjusted flexibly according to disposition, the one, the cloth water yield can change between 0.01 cubic metre/day square metre-0.5 cubic metre/day square metre, the 2nd, the cloth water depth can change, adopt surperficial water distribution summer, adopt the following water distribution of frozen soil layer winter, the 3rd, the water distribution cycle can change: every day, water distribution was 1-4 time.By above-mentioned adjustment, reach best oxygen and utilize effect and wastewater treatment efficiency;
In this system, the plant of being quoted is the temperature tolerance water tolerance rank vegetation, and it not only fully absorbs the carbonic acid gas in the flue gas, reduces the discharging of greenhouse gases, and for plant-growth produces certain oxygen, its rhizosphere also can discharge the utilization of certain oxygen for microorganism; Because the abundance of temperature controlling and moisture content nutrient, plant-growth is rapid, can obtain valuable by product.
The microorganism that this system introduced is except conventional microorganism, and the special bacterial classification of degradation of contaminant and genetically engineered bacterial classification fast in addition can be realized the purpose of fast processing sewage, reduce the floor space of whole ecological treatment facility.
The major equipment of this invention is as follows:
This device is made up of form waste gas of sulfur dioxide treatment unit, flyash re-use device and three parts of waste disposal plant.
A. sulfur oxide emission-control equipment.The form waste gas of sulfur dioxide treatment unit comprises flue gas desulfurization (FGD) unit and ferrous sulfate preparation facilities two portions.Flue gas desulfurization (FGD) unit: exhaust pipe is connected with baffle plate bottom, absorption tower Ta Bi through air pump 2.Two absorption towers 5 connect with serial arrangement, go out on wherein advancing under the vent line, go out under water-filled pipe is enterprising.The air outlet on second absorption tower links to each other by the road with scum dredger 1, and the exhaust of scum dredger is input in the Ecological Disposal unit 23 by the road.The ferrous sulfate preparation facilities: the absorption liquid liquid discharge pipe on first absorption tower and dosing tank 7 rising pipes enter in the mixing tank 8 jointly, mix back liquid and enter settling tank 9 by the road.Settling tank bottom bucket links to each other with water extracter 19 by the road, and the post precipitation supernatant liquor enters iron filings reactor 11 through overflow port place pipeline.The reaction unit water outlet links to each other with water extracter 10, and the liquid after the dehydration enters iron filings reactor 11 once more.
B. coal ash re-use device.Flyash pipeline, cement pipeline and additive pipeline are connected on flyash storehouse 25, cement bin 31 and the additive gauger 30.Flyash storehouse 25 links to each other with cement batcher 32 with flyash gauger 26 respectively with cement bin 31.Flyash gauger, cement batcher and additive gauger are connected with homogenizing mixing device 27 by the road jointly, and the middle water reuse pipe of ecological treatment apparatus is laid on device top.The outlet that mixes homogenization device be connected ball maker and pan-pelletizer 28, pan-pelletizer exit connection solidification device 33.Gas discharge outlet place on solidification device top connects sack cleaner 29, and the finished product of pan-pelletizer transports sorter 34 by the road to, input Ecological Disposal unit 23 after the sorting.
C. waste disposal plant.Sewage arrives grid 14 through waste pipe, and the sewage mouth of grid bottom arrives sump pump 15 by the road.Sump pump is connected to settling tank 16 tops by the road, and the precipitation supernatant liquor transfers to coagulation device 17 through overflow by pipeline.Coagulation device top is laid with the ferrous sulfate for preparing in the flue gas desulphurization system and holds agent interpolation pipe with fixed attention, and behind the coagulation, supernatant liquor flows into second pond 18 through spillway.The supernatant liquor of second pond feeds in the Ecological Disposal unit 23 10 centimeters under the packing layer through outlet pipeline.Sludge drainage system is all arranged at settling tank, coagulation basin and second pond bottom, and mud enters water extracter 19 through the mud pipeline, and after the processing, mud cake is discharged, and the bilge discharge pipe road is connected to second pond 18 tops.Ecological Disposal unit 23 rising pipes are on filler top, and rising pipe is connected to network of rivers network in the municipal administration, flue gas desulfurization (FGD) unit and flyash processing unit (plant) through water pump 24.
These three devices are realized combination in the Ecological Disposal unit.Purging sulfur dioxide gas provides necessary heat of plant and carbonic acid gas for ecological processing unit, and the flyash re-use device provides filler for artificial swamp, and sewage provides the water source for wet land system.Simultaneously, handle reuse water afterwards and can be used as SO
2Absorption liquid also can be used as urban afforestation, carwash, flushing supply, solves the not enough problem of China's water resources.
The beneficial effect that the present invention can reach is: the ecology of municipal effluent is handled and reuse, and former water COD=300-500mg/l handles back COD less than 50mg/l, reaches national standard for recycled water after; The floor space of sewage disposal is: 0.5 square meter/ton water, day; It is 50,000 square meters that day is handled 100,000 tons of sewage floor spaces; Construction cost calculates according to 2000 yuan/square meter floor space, and construction investment is 100,000,000 yuan, and conventional sewage work ton water is made an investment in 1500-1800 unit/ton water, day, day 100,000 tons of investments of processing are hundred million yuan of 1.5-1.8; Present technique ton water current consumption is 0.1KWH only, need not aeration, and therefore handling running cost can be controlled at 0.1-0.2 unit/ton water, and conventional municipal sewage treatment running cost is saved running cost 4-5 doubly at 0.5-0.8 unit/ton water; This technology can reclaim the vegetalitas by product, and its economic worth is different and different with kind; Water during this technology is recyclable is used for various target, and ton water income can reach 0.3-0.5 unit; This Technology can solve the stacking problem of flyash, reduce to take up an area of 50,000 square metres, and every square metre according to 10 yuan of calculating, saves 500,000 yuan of land charges, and its indirect economic effect can't be estimated; The more important thing is, adopted treatment technology cost-effectively, make treatment rate of domestic sewage, processing compliance rate and reclamation rate that very big raising all be arranged, protected China's water surrounding and atmospheric environment, bring great environment and social benefit.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is municipal sewage treatment of the present invention, means of flue gas desulfurization of power plant and Ash Utilization associated plant.
Fig. 2 is flyash prepared filler processing unit (plant) refinement figure of the present invention.
Fig. 3 is waste residue of the present invention, off gas treatment flow process figure.
Fig. 4 is wastewater treatment process figure of the present invention.
Among the figure, 1. scum dredger, 2. air pump, 3. flyash filler processing unit (plant), 4. shower nozzle, 5. absorption tower, 6. filler, 7. dosing tank, 8. mixing tank, 9. settling tank, 10. water extracter, 11. iron filings reactors, 12. absorb liquid baths, 13.FeSO
4Liquid pump, 14. grids, 15. sump pumps, 16. settling tanks, 17. coagulation device, 18. second ponds, 19. water extracters, 20. fillers, 21. wetland plant, 22. printing opacity greenhouses, 23. Ecological Disposal unit, 24. water pumps, 25. the flyash storehouse, 26. flyash gaugers, 27. mix homogenization device, 28. ball maker and pan-pelletizers, 29. sack cleaner, 30. additive gaugers, 31. cement bins, 32. cement batcher, 33. solidification devices, 34. sorters.
Embodiment
Design considerations: day processing water yield: 100,000 tons; Former water COD concentration: 400mg/l; Handle back COD concentration: 50mg/l SO 2 from fume concentration: 500mg/ standard cubic meter; Flue gas after desulfurization sulfur dioxide concentration: 50mg/ standard cubic meter; Preceding temperature: 70-100 ℃ of flue gas desulfurization; Temperature after the flue gas desulfurization: 30-40 ℃; Ecological Disposal cell temperature: summer: 30-35 ℃; Winter: 25-30 ℃;
Processing parameter calculates:
1. settling tank 16: the residence time: 4 hours, 1.7 ten thousand steres were built in below the Ecological Disposal unit.
2. coagulation basin 17: dosing coagulant: 200mg/l; Consumption: 20 tons/day; Amount to 4 tons/day of effective iron amounts; Coagulation reactor: the residence time: 0.2 hour; 800 cubic metres; Second pond 18: 1.5 hours residence time swash plate, volume: 6250 cubic metres, be built under the Ecological Disposal unit.
3. Ecological Disposal unit: 24 hours residence time; Useful volume: 10 ten thousand steres; Available depth: 2.0 meters, floor space 50,000 square meters; Be built in 2 meters of the sewage equalizing tank depth of waters under it, 1.7 meters of available depths, 1.7 ten thousand steres/1.7 meter=10000 square meters; The coagulant precipitation tank depth that is built under it is 2 meters, 1.7 meters of available depths, floor space: 6250/2=3125 square meter; The Ecological Disposal unit is semi-underground structure, 7 meters of total heights; Underground 3 meters, 4 meters on the ground; In 7 meters total heights, equalizing tank etc. account for 2 meters; 2.5 meters on Ecological Disposal layer; 2.5 meters of top soils; The plant-growth of Ecological Disposal unit partly adopts girder steel skeleton and light transmissive material to build up.
4. wetland plant 21 kinds: the kind of wetland economic plants will be used local resistant, moisture-proof and the strong plant of root oxygen carrying capacity according to the different situation of each department as far as possible.Use plant to be reed and cattail in this example, reed is perennial Gramineae reed platymiscium, and cattail is a Typhaceae typha crop.
5. required insulation exhaust gas volumn is: the plant-growth space: 12.5 ten thousand steres; Gas residence time: 2 hours; The flue gas requirement: 6.25 ten thousand steres/hour;
6. flue gas desulfurization and prepare the amount of sulfur dioxide that coagulating agent removes and calculate: effective iron loss amount of every day is 4 tons of iron/skies as previously mentioned; Be equivalent to 71428 moles iron/skies according to 56 calculating of ferro element nucleidic mass, because iron and sulfurous gas mol ratio are 1: 1 in the coagulating agent, so corresponding sulfur dioxide removal amount also is 71428 moles/day, the sulfur dioxide molecule amount is 64, and then its amount of removing is 4.5 tons of sulfurous gas/skies; Removing amount of sulfur dioxide according to every standard cubic meter is 0.45 gram, and promptly 500mg/ cube is removed to 50mg/ cube, but every day, the smoke treatment amount was 4500000 grams/0.45 gram=1000 cubic meters per day.
7. the Ecological Disposal filler amounts to 10 ten thousand steres, and density is about 1.0 kg/liter, needs 100,000 tons of fillers, and the preparation filler consumes 80,000 tons in flyash, makes packing material size 3-6 millimeter.
Claims (2)
1. municipal effluent and means of flue gas desulfurization of power plant and Ash Utilization method is characterized in that,
A. as pending sewage, carry out homogeneous and adjusting; Enter pretreatment stage then, carry out coagulating treatment with the inorganic molysite coagulating agent of by-product in the flue gas desulfurization course, remove suspended particle contact scar thing and colloid pollution thing after, prepare to enter ecological treatment system;
B. ecological treatment system adopts plant-microorganism alternate treatment system, adopt printing opacity greenhouse (22) structure formation, be incubated with the gas behind the coal desulfurization, treatment system adopts intermittently water distribution manner, microbial film absorbs oxygen from flue gas, and the used filler (20) of this treatment system be with coal-fired waste residue flyash and cement by 3: 1-6: make after 1 the mixed; Filler (20) is granular, and diameter is between the 3-10 millimeter, and material is based on flyash, in addition the vesicular inert substance that is prepared into as solidifying agent with cement; The insulation gas temperature that comes from tail gas behind the coal-fired flue gas desulfurization is at 30-40 ℃, contain the oxygen of 5-10% and the carbonic acid gas of 4-8%, can guarantee that the unitary temperature of Ecological Disposal is at 20-30 ℃ winter, can provide competent carbonic acid gas for plant-growth, promote photosynthetic carrying out daytime, provide certain oxygen for plant and microorganism evening, promotes its respiratory, promotes organic decomposition course.
2. realize the equipment of the described municipal effluent of claim 1 and means of flue gas desulfurization of power plant and Ash Utilization method, it is characterized in that, form by form waste gas of sulfur dioxide treatment unit, flyash re-use device and three parts of waste disposal plant;
A. sulfur oxide emission-control equipment; The form waste gas of sulfur dioxide treatment unit comprises flue gas desulfurization (FGD) unit and ferrous sulfate preparation facilities two portions; Flue gas desulfurization (FGD) unit: exhaust pipe is connected with baffle plate bottom, absorption tower Ta Bi through air pump (2); Two absorption towers (5) connect with serial arrangement, go out on wherein advancing under the vent line, go out under water-filled pipe is enterprising; The air outlet on second absorption tower links to each other by the road with scum dredger (1), and the exhaust of scum dredger is input to (23) in the Ecological Disposal unit by the road; The ferrous sulfate preparation facilities: the absorption liquid liquid discharge pipe on first absorption tower and dosing tank (7) rising pipe enter in the mixing tank (8) jointly, mix back liquid and enter settling tank (9) by the road; Settling tank bottom bucket links to each other with water extracter (19) by the road, and the post precipitation supernatant liquor enters iron filings reactor (11) through overflow port place pipeline; The reaction unit water outlet links to each other with water extracter (10), and the liquid after the dehydration enters iron filings reactor (11) once more;
B. coal ash re-use device; Flyash pipeline, cement pipeline and additive pipeline are connected on flyash storehouse (25), cement bin (31) and the additive gauger (30); Flyash storehouse (25) links to each other with cement batcher (32) with flyash gauger (26) respectively with cement bin (31); Flyash gauger, cement batcher and additive gauger are connected with homogenizing mixing device (27) by the road jointly, and the middle water reuse pipe of ecological treatment apparatus is laid on device top; The outlet that mixes homogenization device be connected ball maker and pan-pelletizer (28), pan-pelletizer exit connection solidification device (33); Gas discharge outlet place on solidification device top connects sack cleaner (29), and the finished product of pan-pelletizer transports sorter (34) by the road to, input Ecological Disposal unit (23) after the sorting;
C. waste disposal plant; Sewage arrives grid (14) through waste pipe, and the sewage mouth of grid bottom arrives sump pump (15) by the road; Sump pump is connected to settling tank (16) top by the road, and the precipitation supernatant liquor transfers to coagulation device (17) through overflow by pipeline; Coagulation device top is laid with the ferrous sulfate for preparing in the flue gas desulphurization system and holds agent interpolation pipe with fixed attention, and behind the coagulation, supernatant liquor flows into second pond (18) through spillway; The supernatant liquor of second pond feeds in the Ecological Disposal unit (23) 10 centimeters under the packing layer through outlet pipeline; Sludge drainage system is all arranged at settling tank, coagulation basin and second pond bottom, and mud enters water extracter (19) through the mud pipeline, and after the processing, mud cake is discharged, and the bilge discharge pipe road is connected to second pond (18) top; Ecological Disposal unit (23) rising pipe is on filler top, and rising pipe is connected to network of rivers network in the municipal administration, flue gas desulfurization (FGD) unit and flyash processing unit (plant) through water pump (24).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102003490A CN100344552C (en) | 2005-06-24 | 2005-06-24 | Method and apparatus for treating urban sewage by means of flue gas desulfurization of power plant and fly ash |
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| CNB2005102003490A CN100344552C (en) | 2005-06-24 | 2005-06-24 | Method and apparatus for treating urban sewage by means of flue gas desulfurization of power plant and fly ash |
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| CN1699208A true CN1699208A (en) | 2005-11-23 |
| CN100344552C CN100344552C (en) | 2007-10-24 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410185C (en) * | 2006-09-01 | 2008-08-13 | 清华大学 | Composite fly ash filling and application thereof |
| CN102233236A (en) * | 2010-04-28 | 2011-11-09 | 余蜀翔 | Plant light carbon synthesis oxygen release device |
| CN102485663A (en) * | 2011-03-10 | 2012-06-06 | 中国环境科学研究院 | Constructed wetland composite filling material for water treatment and preparation method thereof |
| CN108025337A (en) * | 2015-09-16 | 2018-05-11 | 韩国电力公社 | Method for handling the equipment of flying dust and flying dust being handled by the equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1273944A (en) * | 1999-05-15 | 2000-11-22 | 张义之 | Process for treating waste water or sewage with powdered coal ash |
| CN1102422C (en) * | 2000-01-18 | 2003-03-05 | 大连理工大学 | Flue gas wet desulfuration and denitration purification process |
-
2005
- 2005-06-24 CN CNB2005102003490A patent/CN100344552C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410185C (en) * | 2006-09-01 | 2008-08-13 | 清华大学 | Composite fly ash filling and application thereof |
| CN102233236A (en) * | 2010-04-28 | 2011-11-09 | 余蜀翔 | Plant light carbon synthesis oxygen release device |
| CN102485663A (en) * | 2011-03-10 | 2012-06-06 | 中国环境科学研究院 | Constructed wetland composite filling material for water treatment and preparation method thereof |
| CN108025337A (en) * | 2015-09-16 | 2018-05-11 | 韩国电力公社 | Method for handling the equipment of flying dust and flying dust being handled by the equipment |
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| Publication number | Publication date |
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| CN100344552C (en) | 2007-10-24 |
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